Thin semiconductor device package

ABSTRACT

A thin semiconductor device package, comprising a thin substrate at least one thin die coupled with the substrate and having a perimeter dimension less than that of the substrate a mold material provided at a surface of the substrate adjacent to the perimeter of the die so that a surface of the mold material is coplanar with a surface of the die, and at least one electrically conductive pathway having at least one first terminal end configured to provide electrical continuity with the conductive element and at least one second terminal end formed at a surface of the mold material, the pathway extending from the first terminal end to the second terminal end.

This is a Divisional application of Ser. No. 11/403,400 filed Apr. 12,2006, now U.S. Pat. No. 7,517,732.

FIELD OF THE INVENTION

The invention relates generally to the field of semiconductor devicemanufacturing. In particular, the invention relates to thinsemiconductor device packages.

BACKGROUND OF THE INVENTION

Increasingly over the past decade, creating smaller and easily portableelectronic devices has become a major force driving innovation inproduct design and technology. This trend has been frustrated to someextent by a coinciding demand for greater functionality, which mayrequire the addition of more components into a device, or growth in thesize of existing components to provide additional functions.

Semiconductor (solid state) circuit devices (referred to also as ‘chips’or ‘die’) are an essential constituent component of most, if not allelectronic devices in use today and being designed for the future. Inmany designs, die are attached to somewhat larger ‘package substrates’which provide sufficient surface area for ‘breaking out’ the electricalsignal from dense interconnect arrays to a number of electricalpathways, or traces, on an even larger substrate. Such packagesubstrates are typically formed as multiple layers of glass fiber,organic resins, copper, and solder mask material. The copper islithographically or otherwise formed into thin traces at multiple levelsof the substrate. Many of the traces then spread outward through thepackage substrate and connect with vias to provide electrical continuitybetween electrical interconnects of the die and an array of, forexample, solder balls on the opposite side of the substrate from thedie. The solder balls provide both physical and electrical attachment toa larger substrate on which other components of the device may reside.

Package substrates, however, present numerous drawbacks detrimental tothe objective of designing very small and relatively inexpensiveportable electronic devices. For one, the package substrate may be themost expensive part of a package, and this cost goes up as the number oflayers in the substrate increases, largely driven by the size anddensity of a die interconnect array. Further, as the thickness of thepackage substrate increases, so the overall thickness of the packageincreases, consuming valuable space in an electronic device, and eitherconstraining or even increasing the minimum size that the device can bedesigned. Therefore, as mentioned, the complexity of a die to supportincreased functionality frequently drives a corresponding increase inthe size and cost of the package and the overall device.

Further, the longer the electrical pathways are formed to sufficientlybreak out an interconnect array in a package, the more the electricalperformance of the package, and therefore the device, is detrimentallyimpacted. Thick substrates may also hinder effective thermal dissipationfrom a device by retaining thermal energy close to the die that shouldpreferably be dissipated away through a passive or active thermaldevice, such as a heat sink. To counter this, many current designsinclude a heat spreader attached to the die to more effectively drawheat away from a die. As can be expected, heat spreaders add both costand size to device packages and electronic devices.

Some manufacturers have taken steps to reduce the size of the cores ofpackage substrates, and coreless substrates have also been proposed.While these approaches do help to reduce the size of package substratesfrom 1 millimeter or more down to approximately 300 microns in somerepresentative package substrates, they still pose a substantialimpediment to further reduction of package size, as well asinsufficiently resolving many of the other associated deficienciesdescribed here. Significant challenges remain to further reducing thesize and cost of highly functional portable electronic devices to keeppace with the demand for such in the market.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 depicts an embodiment of a method for forming a thinsemiconductor device package.

FIG. 2 a depicts in top view, and FIG. 2 b depicts in cross-sectionalview, a thin die with electrically conductive elements formed at a firstside of the die, according to an embodiment of the invention.

FIG. 3 a depicts in top view, and FIG. 3 b depicts in cross-sectionalview, a thin die coupled with a thin substrate, according to anembodiment of the invention.

FIG. 4 a depicts in top view, and FIG. 4 b depicts in cross-sectionalview, a mold material formed at a first side of a thin substrate, themold material also having a surface coplanar with a surface of a thindie at which electrically conductive elements are formed, according toan embodiment of the invention.

FIG. 5 a depicts in top view, and FIG. 5 b depicts in cross-sectionalview, at least one electrically conductive pathway provided at a firstsurface of a mold material at least partially outside the perimeter of athin die and configured to provide electrical continuity with at leastone electrically conductive element provided at a surface of the die,according to an embodiment of the invention.

FIG. 6 a depicts in top view, and FIG. 6 b depicts in cross-sectionalview, at least one attachment member coupled with at least oneelectrically conductive pathway at a surface of a mold material, and atleast one attachment member coupled with at least one electricallyconductive element provided at a surface of a thin die, according to anembodiment of the invention.

FIG. 7 a depicts in top view, and FIG. 7 b depicts in cross-sectionalview, a plurality of electrically conductive pathways provided at asurface of a mold material at least partially outside the perimeter of athin die each pathway configured to provide electrical continuity withat least one electrically conductive element provided at a surface ofthe thin die, according to an embodiment of the invention.

FIGS. 8 a and 8 b depict cross-sectional views of attachment membersprovided to couple a thin semiconductor device package with a substrateaccording to two embodiments of the invention.

FIG. 8 c depicts a cross-sectional view an assembly including a thinsemiconductor device package coupled with a substrate according to anembodiment of the invention.

FIG. 9 depicts a portable device including a thin semiconductor devicepackage according to an embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

Forming a thin semiconductor device package (package), as depicted in anembodiment in FIG. 1 at 100, includes providing at least one conductiveelement at a surface of a die, as at 110, coupling the die with asubstrate, as at 120, providing a mold material at a surface of thesubstrate, as at 130, and providing at least one conductive pathwayconfigured to provide electrical continuity with the conductive element,as at 140. This and other embodiments are described below in greaterdetail.

As depicted in FIGS. 2 a and 2 b, a method for forming a thinsemiconductor device package includes providing at least oneelectrically conductive element (element) 210 at a first surface 220 ofa die 215. An element 210 may be formed of a metallic material, anelectrically conductive organic material, or some other electricallyconductive material. In embodiments having a plurality of elements 210,the elements may be arranged in an evenly spaced array, as shown in FIG.2 a. Alternatively, at least one pair of elements may be a spaced agreater distance apart than at least another pair of elements of thearray,

A die 215, is a thin die in most embodiments of the invention, however,package size reduction benefits may be obtained even where the die isnot a thin die. For example, a thin die may be approximately 0.78millimeter (780 μm) or less in thickness, however, a die which isgreater than 0.78 millimeter in thickness may also be used in a thinpackage wherein other materials in the package are sufficiently thin toprovide an overall package that is thin.

While in some embodiments an element 210 is formed at a first surface220 of a die 215, an element may alternately be formed at a planerecessed below the plane of the first surface 220, having a portion ofthe element presented at or very near the plane of the first surface220. Further, an element 210 may be formed upon the first surface 220 sothat the element 210 lies in substantially the same plane as the firstsurface 220 of the die 215, or maybe formed so that, when viewed inprofile, a portion of the element 210 extends beyond the plane of thefirst surface 220 of the die 215. In each of the embodiments presentedhere, the clement is considered to be provided at the first surface 220of the die 215.

A die 215 generally also has a second surface 225 lying within a planeparallel or substantially parallel with respect to the first surface220, and each of the first surface 220 and the second surface 225 may besubstantially planar. As shown in FIG. 1 at 120, and in an embodimentdepicted in FIGS. 3 a and 3 b, a second surface 225 of at least one thindie 315 is coupled with a first surface 330 of a substrate 331 so thatthe first surface 320 of the die 315 and the elements 310 remain atleast partially exposed. More than one die may also be coupled with asubstrate, to form a multi-die (‘multi-chip’) package.

Generally, the substrate 331 is a thermally conductive material, forexample, copper. The substrate 331 may also be formed thinly, enablingrapid thermal transfer throughout the substrate 331. In an exemplaryembodiment, a substrate 331 is as thin as approximately 0.1 millimeter,although it also may be as thick as approximately 1.0 millimeter.Accordingly, a thin die 315 coupled with such exemplary substrates 331will form a relatively thin semiconductor package. However, theinvention should not be construed as limited to substrates having athickness confined within a range of approximately 0.1-1.0 millimeter,as a thin package may be formed using somewhat thinner or thickersubstrates when coupled with a thin die.

A substrate 331, like a die 315, will typically also have a second side335 lying within a plane parallel or substantially parallel with respectto the first side 330 of the substrate 331. The dimension of theperimeter of the first surface 330 of a substrate 331, in embodiments,will be greater than that of the perimeter of the first surface of theone or more die 315 coupled with the substrate 331, such that a portionof the first surface 330 of the substrate 331 remains uncovered by thedie 315.

Coupling a die 315 with a substrate 331 can be accomplished using athermally conductive bonding material. Such bonding material, accordingto embodiments, may include a metallic solder material, a thermallyconductive organic adhesive, or some other thermally conductive materialcapable of durably bonding a die 315 and a substrate 331, andmaintaining a bond even when exposed to a wide range of thermalvariation. A bonding material may also include a cold formed thermalinterface material (TIM). However, bonding materials that do not addsignificantly to the overall thickness of a coupled die 315 andsubstrate 331 provide advantages in achieving a thin overall package.

As described above, a first surface 320 of a die 315 and a first surface330 of a substrate 331 lie within parallel or substantially parallelplanes with respect to each other. Here, as elsewhere in thisdescription, planes described as being ‘substantially parallel’ may benearly but not absolutely parallel, as may result from limitations inthe ability to control conditions of operations or materials throughoutthe formation of embodiments of the invention.

As shown in the embodiment in FIG. 1 at 130, and further depicted inFIGS. 4 a and 4 b, a mold material 441 is provided at a first surface430 of a substrate 431, adjacent to the perimeter of a die 415 coupledwith the substrate 431. Providing a mold material 441 may include,according to various embodiments, dispensing, forming and curing aliquidous material, applying and adhering (e.g., laminating) a solidmold material, or disposing, forming, and curing a malleable semi-solidmold material, although other methods may also be used. The moldmaterial 441 is provided with at least a first surface 440 that iscoplanar or substantially coplanar with respect to the first surface 420of the die 415, and also a second surface wherein the first and secondsurfaces lie within parallel or substantially parallel planes withrespect to each other. Further, the second surface of the mold material441 will generally lie in a plane parallel or substantially parallelwith respect to, and adjacent to the first surface 430 of the substrate431, so that the second surface of the mold material 441 is physically,and in embodiments, adhesively coupled with the first surface 430 of thesubstrate 431. The mold material, in embodiments, is provided at thefirst surface 430 of a substrate 431 so that a perimeter of the moldmaterial 441 is fully coextensive with a perimeter of the substrate 431,as depicted in FIGS. 4 a and 4 b. In other embodiments, a perimeter ofthe mold material 441 may not be fully coextensive with a perimeter ofthe substrate 431, but larger or smaller than at least a portion of aperimeter of the substrate 431.

A die 415 includes a plurality of sides defining a perimeter of the die415, and mold material 441 provided adjacent with a perimeter of the die415 will dimensionally conform closely with at least a first side of thedie. Thus, in embodiments, the first surface 440 of a provided moldmaterial 441, closely conforming with at least a side of a die 415,forms an extended surface from the first surface 420 of the die. Fordescriptive purposes, a boundary of a provided mold material 441proximate to and closely conforming with a side of a die 415 will bereferred to as a ‘die side edge’ hereinafter. A die side edge of a moldmaterial 441 will generally closely abut with a side of a die 415 sothat a gap, or void, will be minimal or absent at a boundary between thedie 415 and the die side edge of the mold material 441. In this manner,a surface formed by the coplanar or substantially coplanar firstsurfaces of the die 415 and the mold material 441 may form a contiguousor substantially contiguous surface.

Coefficients of thermal expansion (CTE) of materials used in embodimentsof the invention for a mold material, die, substrate, and/or bondingmaterial may not be equal to that of any or all of the other materialstherein. Therefore, although disposed according to embodiments asdescribed herein, when subjected to changing thermal conditions,materials in embodiments may expand or contract at different rates,altering physical and/or positional relationships within thoseembodiments at a second temperature (T₂) as compared to those samerelationships at a first temperature (T₁). As preserving physical and/orpositional relationships between materials, for example, dimensionalrelationships, may be advantageous, and because embodiments of theinvention may be subjected to changing thermal conditions duringmanufacturing and/or use, materials having substantially uniform CTEsmay be used in embodiments to minimize changes in those relationshipswithin a range of thermal conditions. In an exemplary embodiment, usingsilicon filler as a substantial constituent material in a mold materialwill provide the mold material with a CTE closely matching that of asilicon die. In other embodiments, where slight changes in physicaland/or positional relationships can be tolerated without detrimentalimpact, materials having less uniform CTEs can be used.

As described with regard to FIG. 1 at 140, and depicted in embodimentsin FIGS. 5 a and 5 b, at least one electrically conductive pathway(pathway) 550, having at least a first terminal end 553 and at least asecond terminal end 555, is provided at the first surface of the die 515and the first surface of the mold material 440. The first terminal end553 is configured to provide electrical continuity with at least oneconductive element 510 at the first surface 520 of the die 515. Thepathway extends from at least one first terminal end 553, outwardlyrelative to the center of the die 515 to at least one second terminalend 555 at the first surface 540 of the mold material 541, the locationof the second terminal end 555 being at least partially outside theperimeter of the die 515.

In an exemplary embodiment, copper is disposed at the first surface 520of the die 515 and the first surface 540 of the mold material 541. Thecopper is then lithographically patterned and etched so that copperpathways 550 remain. In another exemplary embodiment, copper nanopasteis printed at the first surfaces of the die 515 and mold material 541using ink jet printing methods to form conductive pathways. Othermethods of disposing copper nanopaste may be used according to otherembodiments. Copper nanopaste provides benefits in that it sinters at alower temperature than conventional copper paste materials. For example,copper nanopaste sinters at approximately 300° C., while a conventionalcopper paste sinters at approximately 400° C. or higher. In otherembodiments, pathways may be formed of other conductive materials, suchas silver. Although only a limited number of exemplary embodiments forforming pathways 550 are specifically described herein, one of ordinaryskill in the art would recognize that the embodiments are not solimited.

The pathways 550 may be configured as fine lines to allow routingelectrical signals outward from a large number of conductive elements510 at the first surface 520 of the die 515. Pathways 550 may beconfigured to provide electrical continuity with only elements 510 nearthe perimeter of a die 515, or as depicted in FIGS. 7 a and 7 b,pathways 750 may be configured to provide electrical continuity withelectrical elements 710 closer to the center of the die 715 as well asnear its perimeter. In embodiments, a plurality of conductive pathways750 are formed and arranged at the respective first surfaces 720, 740 ofa die 715 and mold material 741 so that each pathway 750 is physicallyand/or electrically isolated from each other pathway. A pathway may beconfigured to provide electrical continuity with more than oneconductive element, and may have a plurality of first terminal ends.Likewise, a pathway may have a plurality of second terminal ends, whilehaving either one first terminal end or a plurality of first terminalends.

In an embodiment such as that depicted in FIG. 5, a second terminal end555 (FIG. 5) of a pathway 550 is configured to electrically couple withan attachment member. In an exemplary embodiment depicted in FIG. 6, anattachment member is a solder ball 665, such as those used in ball gridarray (BGA) devices. An attachment member may, however, be a solderbump, a controlled collapse chip connect (C4) structure, or a stud bump,although the embodiments of an attachment member are not so limited.Therefore, an attachment member may be provided at a first surface 640of a mold material 641 and physically and/or electrically coupled with asecond terminal end 555 of a pathway 650. As shown in FIGS. 6 a and 6 b,attachment members 660 may be physically and/or electrically coupledwith conductive elements 610 that are not physically and/or electricallycoupled with pathways 650 provided at a first surface 620 of a die 615.Therefore, in embodiments having a large number of conductive elements610, where it may be difficult to route pathways 650 outward from allconductive elements 610, not all conductive elements 610 need to beprovided with pathways. Rather, in an exemplary embodiment, anattachment member 660 provides electrical continuity between aconductive element 610 and a conductive element of a substrate withwhich a package is also physically coupled. Embodiments such as thosedepicted in FIGS. 6 a and 6 b may be considered BGA packages.

In the embodiment depicted in FIG. 8 a, attachment members 863 of apackage 801 are arranged so as to couple physically and/or electricallywith conductive elements 871 at a surface of a substrate 870. In otherembodiments, such as that depicted in FIG. 8 b, at least one attachmentmember 868 may be provided at a surface of a substrate 872, and becomesphysically and/or electrically coupled with a package when the package803 is coupled with the substrate, as depicted in FIG. 8 c. In stillother embodiments, at least one attachment member may be coupled with atleast one conductive element of a package, and/or at least one secondterminal end of a pathway of a package, and also with conductiveelements 871 at a surface of a substrate, prior to coupling the packagewith the substrate. Whether attachment members are initially coupledwith a package, as in the embodiment depicted in FIG. 8 a, or with asubstrate, as in the embodiment depicted in FIG. 8 b, attachment membersmay couple a package 805 with a substrate 874 to form an electronicassembly, as depicted in an exemplary embodiment in FIG. 8 c.

Embodiments of a thin semiconductor package described herein may beformed with a total thickness of less than approximately 1.6millimeters, providing a very low profile package for use inapplications with limited available space. Of course, packages thickerthan approximately 1.6 millimeters may also be considered ‘thinpackages’, however, they may not be suitable for some portable deviceapplications.

In embodiments, the substrate 874 of an electronic assembly may be aprinted circuit substrate of a portable electronic device in which athin semiconductor device package may be used. Examples of portableelectronic devices include devices configured for wireless communication(e.g., cellular phones), entertainment (e.g., MP3 music players),measurement (e.g., global positioning system unit), data collection(e.g., UPC code reader), computing (e.g., palm top computer), or anyother device configured so that it may be carried from one location toanother by a person. In embodiments, a portable device is designed to beinstalled and transported within a vehicle. In other embodiments, asubstrate of an electronic assembly may be configured for use within avery confined space, and therefore must be of a relatively small size.In an exemplary embodiment, a device is a medical device configured foruse inside a patient. Exemplary embodiments include a heart pacemaker ora device for enhancement of auditory function. A substrate may also bepart of an assembly configured to be physically received and/or retainedat least partially within an electronic device, or otherwise coupledtherewith wherein the assembly is configured for either one-wav ortwo-way transfer of electrical signals with the electronic device. Anexemplary embodiment of such a substrate includes a printed circuit card(e.g. network communication card) configured for insertion into a slotof a portable personal computer.

According to embodiments of the invention, a device including a packageassembly will also include at least one member (input member) configuredto allow input to the device. In an exemplary embodiment, an inputmember is an antenna to provide input of transmitted wireless signals tothe device. In the embodiment depicted in FIG. 9, the input member 910is a keypad for manual entry of, for example, information orinstructions, into the device 900. In another embodiment, an inputmember is an input/output interconnection member (e.g., port, I/Oconnector) configured to couple with a reciprocal interconnectionmember. A reciprocal interconnection member may be further coupled witha conductive pathway (e.g., cable) for conveying data to and/or from thedevice. In still another embodiment, an input member may be a sensorconfigured to be affected by an ambient condition (e.g., thermal,chemical, physical, radiological), and further configured to influence aresponse in the device as a result of the affect. In an exemplaryembodiment, the ambient temperature surrounding a sensor may influence aresponse whereby the ambient temperature is quantified by the device andthe quantified temperature is visually displayed on an output member ofthe device. As should also be understood from this example, a device mayalso include an output member. In embodiments such as that depicted inFIG. 9, wherein an output member 920 is a visual display, exemplaryembodiments may include a graphical display (e.g., liquid crystaldisplay (LCD), plasma display), and/or light emitting diodes (LED). Inother embodiments, an output member may provide auditory output (e.g. aspeaker), or provide output of an electrical signal that may cause aresponse in another device. In the embodiment depicted in FIG. 9, anoutput member 930 is an output jack to which a headphone 940 can beconnected, the headphone 940 producing audible sound in response to anelectrical output from the output member (jack) 930 of the device.

In embodiments of a device having an input device, a thin semiconductordevice package assembly may be configured to receive input (e.g.,electrical signals) from the input device. Likewise, in embodimentshaving an output device, a thin semiconductor device package assemblymay be configured to transfer output (e.g., electrical signals) to theoutput device, Therefore, in embodiments, a thin device package will beelectrically coupled with at least one of an output device and/or aninput device.

While embodiments of the invention may provide particularly compellingbenefits for portable devices, no such use limitation should beconstrued from the descriptions provided herein. Embodiments of theinvention may likewise provide benefits when used in relatively largerelectronic devices where a limited amount of space is available within ahousing of an electronic device, and a thin semiconductor device packagemay be placed within the limited available space. Also, because a thinsemiconductor package may also provide enhanced efficiency in thermalmanagement, an embodiment may be used in an electronic device where suchefficiencies provide a benefit. Therefore, it should be understood thatonly a subset of the possible embodiments of an electronic deviceemploying a thin semiconductor device package are described herein, andthat no limitation of embodiments should be construed from the provideddescription.

The foregoing detailed description and accompanying drawings are onlyillustrative and not restrictive. They have been provided primarily fora clear and comprehensive understanding of the embodiments of theinvention, and no unnecessary limitations are to be understoodtherefrom. Numerous additions, deletions, and modifications to theembodiments described herein, as well as alternative arrangements, maybe devised by those skilled in the art without departing from the spiritof the embodiments and the scope of the appended claims.

1. An electronic device, comprising: a thin semiconductor device packagecomprising at least one thin die coupled with a thin substrate, a moldmaterial disposed at a surface of the substrate and proximate to atleast one side of the die, the mold material having a surface that iscoplanar with and substantially contiguous with an exposed surface ofthe die, and having at least one electrically conductive pathway, thepathway having at least a first terminal end disposed at the exposed diesurface and providing electrical continuity with at least one conductiveelement at the exposed die surface, and at least a second terminal enddisposed at the coplanar surface of the mold material outside theperimeter of the die; and at least one input member.
 2. The electronicdevice of claim 1, wherein the electronic device is configured forportability.
 3. The electronic device of claim 1, wherein the devicefurther comprises an output member.
 4. The electronic device of claim 1,wherein the thin semiconductor device package assembly is configured toreceive input from the input member.
 5. A thin semiconductor devicepackage, comprising: a thin substrate having at least a first surface;at least one thin die having a first surface and a second surface, thefirst surface being exposed and having at least one electricallyconductive element formed thereon, the second surface lying within aplane parallel with a plane of the first surface, the second surfacebeing coupled with the first surface of the substrate, and the diehaving a perimeter dimension less than that of the substrate; a moldmaterial provide at the first surface of the substrate adjacent to atleast one side of the die, the mold material having a first surface anda second surface, the first surface lying within a plane substantiallyparallel with a plane of the second surface, and coplanar with the firstsurface of the die, and the second surface being coupled with the firstsurface of the substrate; and, at least one electrically conductivepathway wherein at least a first terminal end of the pathway is providedat the first surface of the die and provides electrical continuity withthe conductive element, and at least a second terminal end of thepathway is provided at the first surface of the mold material at leastpartially outside the perimeter of the die.
 6. The package of claim 5,wherein the substrate is a thermally conductive material.
 7. The packageof claim 5, wherein the electrically conductive pathway comprisessintered copper nanopaste.
 8. The package of claim 5, wherein the secondterminal end of the pathway is electrically coupled with an attachmentmember.
 9. The package of claim 5, wherein the package is a BGA package.10. The package of claim 5, further comprising coupling at least onesolder ball with the at least one second terminal end.
 11. An electronicassembly, comprising: a printed circuit substrate of a wirelesscommunication device; and, at least one thin semiconductor devicepackage coupled with the substrate, the package comprising, a thinsubstrate having a first surface; at least one thin die having a firstsurface and a second surface, the first surface being exposed and havingat least one electrically conductive element formed thereon, the secondsurface being parallel with the first surface and coupled with the firstsurface of the substrate, the die having a perimeter dimension less thanthat of the substrate; a mold material provided at the first surface ofthe substrate adjacent to the perimeter of the die, the mold materialhaving a first surface and a second surface, the first surface beingparallel with the second surface and coplanar with the first surface ofthe die, and the second surface being coupled with the first surface ofthe substrate; and, at least one electrically conductive pathwaycomprising at least a first terminal end provided at the first surfaceof the die and provides electrical continuity with the conductiveelement, and at least a second terminal end provided at the firstsurface of the mold material at least partially outside the perimeter ofthe die.
 12. The assembly of claim 11, wherein the package is at leastone of physically and electrically coupled with the substrate by atleast one attachment member.
 13. The assembly of claim 11, wherein theassembly is physically received at least partially within the housing ofthe wireless communication device.
 14. The assembly of claim 11, whereinthe assembly transfers electrical signals with an electronic device.